drm/i915/scaler: Use intel_display as argument to skl_scaler_max_src_size

skl_scaler_max_src_size has really no use of intel_crtc other than
deriving intel_display. Let's just pass intel_display to it directly.

Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com>
Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Link: https://lore.kernel.org/r/20250708043328.1086192-1-suraj.kandpal@intel.com